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GM 9½" Ring Gear 14 Bolt Rear Differential Cover

For Hummer H2, TBSS, GMC/Chevy Trucks and SUVs
Part Number 10303-2

PML makes three covers for this differential. See all PML GM 9½" rear differential covers to compare.

PML GM 9½ Diff Cover for H2, as-cast
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PML GM 9½ Diff Cover for H2, black powder coat
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PML GM 9½ Diff Cover for H2, polished
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As-cast finish
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Black powder coating
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Polished finish
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Volume: 0.5 quart over stock

Dimensions: Click here for dimensions.

This PML cover fits the GM 9½" ring gear, 14 bolt rear differential. PML makes three different covers for the many GMC and Chevrolet trucks, vans and SUVs with this differential.

PML designed this cover specifically for vehicles needing clearance for pan hard and sway bars and still want the benefits of an aftermarket heavy duty cover. For example:

  • Hummer H2, 2003 to 2009
  • Trailblazer SS, 2006 to 2009
  • SSR 6 speed, 2005 to 2006
  • Some Cadillac SUVs

Vehicle configurations vary so always check your configuration and clearance before ordering.

Other vehicles can use this cover but may need different threads on the bolts. All the Hummer H2, Trailblazer SS, and SSR vehicles we have seen use M8–1.25x21mm stock bolts. Contact us if you have a vehicle other than listed above.

Nissan Titan 2016 and newer: These trucks have a similar rear stock cover. See PML Products In Development.

We have two of these covers on SPECIAL: Special #309 and Special #320

Drain, Inside of Cover, Included With Cover

Drain hole on PML H2 differential cover    Inside of PML H2 differential cover    Inside of PML H2 differential cover
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Drain is on the bottom of the cover, fill hole on the side. There is a boss below the fill hole that can be drilled and tapped for a temperature sending unit. Optional machining avaialble in shopping cart.

Inside and out, cover follows the same general profile curve as the stock cover.

PML includes new mounting bolts, a fill plug and a magnetic drain plug with each cover.

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 10303-2 height compared to stock  PML Differential Cover Part Number 10303-2, compared to stock
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These images show this PML differential cover compared to the stock cover.

This image compares the depth of all PML GM 9 1/2, 14 bolt differential covers and the stock cover. Click on image to view larger in a new tab or window.
PML GM 14 bolt differential covers depth comparisons


The sway bar and pan hard (track) bar may be in the way during installation. Plan on temporarily dropping or loosening these bars to swap out the stock cover for the PML cover.

H2 Hummer

Pictures are installations of this PML cover on three different H2 Hummers are below. The ones one the left and right are black powder coated and the one in the middle is polished. All have been customized with lift kits. The image on the right is courtesy of Scott who also installed and sent us a picture of PML's 4L65E transmission pan installed.

PML rear end differential cover on a Hummer H2, black powder coat finish     PML rear end differential cover on a Hummer H2, polished finish     PML H2 differential cover

2009 Trailblazer SS

This PML differential cover and the PML 4L75E transmission pan were both installed on this 2009 Trailblazer SS.

2009 Trailblazer SS    2009 Trailblazer SS with PML
4L75E transmission pan installed    PML cover on 2009 TBSS
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2007 Cadillac Escalade

Kirt installed this cover on his 2007 Cadillac Escalade 6.2L 2WD. He reported that the rear track bar needed to come off to get the cover on, but there is about 1/4 inch clearance when it is all back together. His Escalade uses the same bolts as the H2 (M8–1.25x21mm). Our thanks to Kirt for letting us know.

2006 Trailblazer SS

GM 9.5 differential  Installing PML cover on 2006 Trailblazer SS  PML cover installed on 2006 TBSS  2006 TBSS
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2000 Silverado 2500

PML GM differential cover installed on a Silverado 2500

The image shows this PML 14 bolt 9.5 ring gear straight fin cover installed on a 2000 Silverado 2500 6.0 LS. This cover is in the natural as-cast finish.

Our thanks to Eugene (retired Marine) for sending us pictures of his installation and for his service to our country.

For a larger picture, please click one of the above images. A separate window will open showing a bigger picture. (The larger pictures take a minute to display.)

PML Differential Cover Features:

  • Increased oil capacity for cooler temperatures
  • Sand-cast aluminum with raised fins
  • 3/16-inch thick wall construction to add strength to differential housing
  • 3/8-inch thick gasket flange will not bend when bolts are tightened
  • Machined gasket surface for a secure seal using RTV or factory reusable gasket
  • Oil changes without removing the cover
  • All hardware provided, including magnetic drain plug

Learn more about finishes and construction of PML parts.